SOLUTION: A small airplane flies 810 miles with an average speed of 270 miles per hour. 1.5 hours after the plane leaves, a Boeing 747 leaves from the same point. Both planes arrive at the s

Question 677045: A small airplane flies 810 miles with an average speed of 270 miles per hour. 1.5 hours after the plane leaves, a Boeing 747 leaves from the same point. Both planes arrive at the same time; what was the average speed of the 747?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A small airplane flies 810 miles with an average speed of 270 miles per hour.
1.5 hours after the plane leaves, a Boeing 747 leaves from the same point.
Both planes arrive at the same time; what was the average speed of the 747?
:
let s = the speed of the 747
:
Write a time equation; time = dist/speed
:
747 time + 1.5 hrs = small plane time
+ 1.5 =
+ 1.5 = 3
= 3 - 1.5
= 1.5
1.5s = 810
s = 810/1.5
s = 540 mph
:
Check this, find the 747 time
810/540 = 1.5 hrs

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